Thermodynamic Analysis of a Cascade Refrigeration System

• Authors: R. Karaali
• Languages of publication: EN

Abstracts

EN

There is a need for cooling by using the waste heat energy in food industry. Absorption cycles can be driven by waste thermal, geothermal, solar or industrial processes energies. In this study, cascade refrigeration system is thermodynamically modeled, and analyzed by using first law of thermodynamics, and exergy method. Thermodynamic properties such as pressure, temperature, entropy, enthalpy, exergy, mass flow rate in each stream are calculated for 50, 75, 100°C and for 0.8, 1.0, and 1.5 MPa pump pressure. A computer program is used that was prepared in FORTRAN by the author for the analyses. It is found that the compression-absorption cascade cooling cycle is appropriate for most of the kind of waste heat applications. Increase of the generator inlet heat temperature increases the generator inlet heat, the absorber outlet heat and the condenser 2 outlet heat energies and decreases the coefficient of performance of the absorption and the overall cycles. The generator heat decreases with increase of the pump pressure. Also increase of the pump pressure decreases the coefficient of performance of the absorption and the overall cycles. Increase of the pump pressure and the generator temperature decreases the exergetic coefficient of performance. Increase of the generator temperature and pump pressure increases the generator inlet exergy. It is concluded that increase of the generator temperature and the pump pressure increases the total destructed exergy of the cycle.

Keywords

EN

88.05.Sv; 88.10.cn

Discipline

• 88.10.cn: Heating and cooling of buildings; space heating(for solar heating and cooling of residential and commercial buildings, see 88.40.me)
• 88.05.Sv: Energy use in heating and cooling of residential and commercial buildings(for solar heating and cooling of residential and commercial buildings, see 88.40.me; for geothermal energy use in heating and cooling of buildings, see 88.10.cn)

• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 130
• Issue: 1
• Pages: 101-106

Dates

published

2016-07

Contributors

author

R. Karaali

• Department of Mechanical Engineering, Bayburt University, 69000 Bayburt, Turkey

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Identifiers

DOI

10.12693/APhysPolA.130.101